Patents Assigned to NEC Electronics U.S.A., Inc.
  • Digital phase lock loop circuit
    Patent number: 4617679
    Abstract: A digital phase lock loop (PLL) circuit adaptable to a hard disk drive. The PLL operable at a high speed comprises a pulse shaper for subjecting raw data pulses from the disk drive to waveform-shaping, a phase comparator for producing a phase control pulse on the basis of the relative positions of a delayed reference clock (VCLK) pulse and each of said waveform-shaped data pulses from the shaper, and a phase shifter for generating the VCLK pulse in response to the phase control pulse.
    Type: Grant
    Filed: September 20, 1983
    Date of Patent: October 14, 1986
    Assignee: NEC Electronics U.S.A., Inc.
    Inventor: Phillip L. Brooks